Technologies for securely extending cloud service APIs in a cloud service marketplace

Technologies for securely extending cloud service application programming interfaces (APIs) in a cloud service marketplace include a connector hub of a marketplace computing device communicatively coupled to a cloud service provider interface of a cloud service provider and a cloud service broker interface of a cloud service broker. The connector hub is configured to deploy an API connector instance in a connection factory of the marketplace computing device, transmit provider provisioning channel credentials to the API connector instance and the cloud service provider interface and transmit broker provisioning channel credentials to the API connector instance and the cloud service broker interface. The connector hub is additionally configured establish a provisioning channel between the cloud service provider interface and the cloud service broker interface. Additional embodiments are described herein.